Telefonaktiebolaget Lm Ericsson (publ)

Ang Feng

Jinlai He

Guangsheng Guo

Yaxin Xing

Dong Wang

Chen Wang

Tao Huang

Nan Wang

Jinsong Yang

Yushi Zhang

Ailing Xie

Guozhu Li

A method for antenna calibration for an active antenna system is disclosed. According to an embodiment, test signals are generated for multiple antennas of the active antenna system. The test signals are transmitted via the multiple antennas. A first signal that results from the transmission of the test signals is received over the air. A second signal is received from a coupler network of the active antenna system. The coupler network is configured to generate coupled signals of the test signals and combine the coupled signals into the second signal. Calibration information for compensating an influence of the coupler network is determined based on the first and second signals. An active antenna system is also disclosed for use in antenna calibration.

Method for antenna calibration and active antenna system for use in antenna calibration

It provides a method () for polar decoding a received signal into a number, N, of bits with Successive Cancellation List, SCL. The method () includes: at the i-th level of a binary tree for decoding the i-th bit of the N bits, where 1&#x2264;i&#x2264;N: when the i-th bit is an information bit, calculating () a path metric for each of 2*Lcandidate paths at the i-th level, where Lis an SCL size at the (i&#x2212;1)-th level and L=1; setting () an SCL size at the i-th level, L, based on Land a statistical distribution of the path metrics calculated for the 2*Lcandidate paths; and selecting () Lsurviving paths from the 2*Lcandidate paths based on their respective path metrics.

Method for polar decoding with dynamic successive cancellation list size and polar decoder

In one example aspect, a method is provided of preparing a symbol for transmission, the method comprising applying a window function to a symbol to generate a modified symbol, wherein a property of the window function is based on a channel length of a transmission channel over which the modified symbol is to be transmitted, and causing the modified symbol to be transmitted over the transmission channel.

Preparing a symbol for transmission

A method for compressing IQ data for high speed transport link and an associated device. The method comprises: determining, based on dynamical statistical distribution of the IQ data, one or more parameters of a companding function for a nonlinear companding operation (S); applying the companding function with the determined one or more parameters on the IQ data (S); performing uniform quantization on the IQ data to generate compressed IQ data (S); and transmitting the compressed IQ (S). And a method for decompressing compressed IQ data for high speed transport link, and an associated device.

Methods for compressing and decompressing IQ data, and associated devices

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Beijing, China

Ang Feng